Optical Fiber Refractive Index Sensor for Chloride Ion Monitoring

Lam, Cathy Chung Chun; Mandamparambil, Rajesh; Sun, Tao; Grattan, K. T. V.; Nanukuttan, Sreejith; Taylor, Su

doi:10.1109/jsen.2009.2016597

Cited by 38 publications

(22 citation statements)

References 16 publications

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“…This sensor is extremely sensitive to any changes in Refractive Index (RI) of the grating surrounding. The selectivity toward chloride is enhanced by incorporating a monolayer of self-assembled gold colloids with the LPG [78]. Tang and Wang 2007 [73] used this approach to measure chloride ion concentration in concrete.…”

Section: Fiber Optic Sensormentioning

confidence: 99%

Non-destructive measurement of chloride ions concentration in concrete – A comparative analysis of limitations and prospects

Abbas

Pargar

Koleva

et al. 2018

Construction and Building Materials

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h i g h l i g h t s Measuring chloride is crucial for service life assessment of concrete structures. Measurement techniques mainly based on electrochemistry and electromagnetics. Based on the level of assessment different techniques have pro and cons. For existing structure assessment varies from visual to detailed lab investigation. Electrochemical sensor are suitable for installation in new structures.

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Section: Fiber Optic Sensormentioning

confidence: 99%

Non-destructive measurement of chloride ions concentration in concrete – A comparative analysis of limitations and prospects

Abbas

Pargar

Koleva

et al. 2018

Construction and Building Materials

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“…Such low sensitivity at the RI of 1.33 makes the conventional LPFG unsuitable as a RI sensor for applications for water quality monitoring. Previous reports show that the assembling or specific coating of thin films on the LPFGs can enhance the RI sensing range, sensitivity, or specificity [18][19][20][21][22][23]. However, most of these methods require very precise fabrication techniques with long and complex fabrication processes [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Carbon-nanotube-deposited long period fiber grating for continuous refractive index sensor applications

Tan

Mamidala

et al. 2014

Sensors and Actuators B: Chemical

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We present a carbon-nanotube-deposited long period fiber grating for refractive index sensing applications in liquid. Carbon nanotubes are deposited around the surface of a long period fiber grating to form the refractive index sensing element. The sensing mechanism relies mainly on the high refractive index properties of the carbon nanotube thin film, which enhances the cladding mode of the long period fiber grating in order to have a significant interaction between the propagating light and the target medium. A sensitivity of 31 dB/ RIU and 47 dB/ RIU are obtained for the refractive index ranges of 1.33 to 1.38 and 1.38 to 1.42, respectively, which have not been demonstrated with normal long period fiber gratings as the sensing element. As the sensing mechanism is based on the change of the transmitted optical power, our proposed scheme can intrinsically solve the limitations of the free spectral range commonly seen in other reported schemes, and continuous and repeatable measurements can be obtained while only acquiring errors mainly from the power fluctuations from the light source. The fiber grating also does not require any further mechanical modification like etching or tapering, which allows the sensing *Manuscript Click here to view linked References Y. C. Tan et. al., "Carbon-Nanotube-Deposited Long Period Fiber Grating ……" p. 2 element to have the advantage of mechanical strength for practical applications. The experimental results are consistent with the modeling of the sensing mechanism.

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“…Non-destructive techniques (NDTs) comprise methods that do not alter the future usefulness of the material where the measurement is taken. According to [4], the most developed and studied NDT methods could be categorized as ion selective electrodes (ISEs) [48,49], electrical resistivity (ER) [50,51], and the optical fiber sensor (OFS) [52,53].…”

Section: Measuring Techniquesmentioning

confidence: 99%

Value of Information (VoI) for the Chloride Content in Reinforced Concrete Bridges

et al. 2020

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The corrosion of reinforcement caused by chloride ingress significantly reduces the length of the service life of reinforced concrete bridges. Therefore, the condition of bridges is periodically inspected by specially trained engineers regarding the possible occurrence of reinforcement corrosion. Their main goal is to ensure that the structure can resist mechanical and environmental loads and offer a satisfactory level of safety and serviceability. In the course of assessment, measuring the chloride content, through which corrosion could be anticipated and prevented, presents a possible alternative to visual inspections and corrosion tests that can only indicate already existing corrosion. It is hard to determine the cost-effectiveness and actual value of chloride content measurements in a simple and straightforward way. Thus, the main aim of the paper was to study the value of newly gained information, which is obtained when a chloride content in reinforced concrete bridges is measured. This value was here analyzed through the pre-posterior analysis of the cost of measurement and repair, taking into account different types of exposure and material properties for a general case. The research focus was set on the initiation phase in which there are no visible damages. A relative comparison of costs is presented, where the cost of possible reactive/proactive repair was compared with the maximum cost of measurement, while the measurement is still cost effective. The analysis showed a high influence of the initial probability of depassivation on the maximum cost of the cost-effective measurement, as well as a nonreciprocal relation of the minimum cost of cost-effective reactive repair with the measurement accuracy.

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Optical Fiber Refractive Index Sensor for Chloride Ion Monitoring

Cited by 38 publications

References 16 publications

Non-destructive measurement of chloride ions concentration in concrete – A comparative analysis of limitations and prospects

Non-destructive measurement of chloride ions concentration in concrete – A comparative analysis of limitations and prospects

Carbon-nanotube-deposited long period fiber grating for continuous refractive index sensor applications

Value of Information (VoI) for the Chloride Content in Reinforced Concrete Bridges

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